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We present a time-dependent analysis of CP violation in B0 -> rho pi decaysbased on a 140 1/fb data sample collected at the Y(4S) resonance with the Belledetector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct oneneutral B meson in the rho+-pi-+ final state and identify the flavor of theaccompanying B meson from its decay products. We obtain the charge asymmetryACP = -0.16+-0.10(stat)+-0.02(syst). An unbinned maximum likelihood fit to theproper-time distributions yields C = 0.25+-0.17(stat)+0.02-0.06(syst), DC =0.38+-0.18(stat)+0.02-0.04(syst), S = -0.28+-0.23(stat)+0.10-0.08(syst), and DS= -0.30+-0.24(stat)+-0.09(syst). The direct CP violation parameters for B ->rho+pi- and B -> rho-pi+ decays are A+- = -0.02+-0.16(stat)+0.05-0.02(syst) andA-+ = -0.53+-0.29(stat)+0.09-0.04(syst).Comment: 10 pages, 3 figures, submitted to Phys. Rev. Let

physical review letters

Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>ρ</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>∓</mml:mo></mml:msup></mml:math>Time-Dependent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Violation at Belle

Study ofB0→ρ±π∓Time-DependentCPViolation at Belle